Plumb-bob



(NO-Model) J. M. CAMERON.

PLUMB BOB.

No. 409,917. PatentedAug. 27, 18819.

WITNESS i //v wig/2 W BY Mum,

ATTORNEYS.

UNITED STATES PATENT OFFICE.

JOHN M. CAMERON, OF PHILADELPHIA, PENNSYLVANIA.

PLUMB-BOB.

SPECIFICATION forming part of Letters Patent No. 409,917, dated August 2'7, 1889.

Application filed September 18, 1888. Serial No. 285,688. (No model.)

To all whom it may concern.-

Be it known that I, JOHN M. CAMERON, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a new and Improved Plumb-Bob, of which the following is a specification, reference being had to the annexed drawings, forming a part thereof, in which Figure 1 is a side elevation of my improved plumb-bob. Fig. 2 is 'a vertical diametrical section of the same. Fig. 3 is a transverse section taken on line 00 :0 of Fig. 1. Fig. et is a transverse section taken on line 3 y of Fig. 2, and Fig. 5 is aperspective view of the plumbbob point.

Similar letters of reference indicate corresponding parts in all the views.

The object of my invention is to provide a plumb-bob in which the point is adjustable to adapt it to different kinds of work.

My invention consists in the combination, with an axially-bored plumb-bob, of a point inserted in the bore of the plumb-bob and adapted to be extended or withdrawn.

The invention also consists in the combination, with the adjustable point, of a clamp for holding a needle-point and a needle fitted thereto,all as hereinafter more fully described.

The body A of the plumb-bob is of spheroidal for1n,with extensions a 1) upon the upper and lower sides thereof. The bodyA is bored from the lower end to a point near the upper end to receive the movable point B, and a hole 0 extends through the top of the bob into the central bore to receive the plumb-line. Around the lower part of the bore of the body A is formed an annular. chamber (1, in which is inserted a split spring-ring 6, whose internal diameter is made a little less than the diameter of the point B, to adapt it to bind the said point and hold it in any desired position.

In diametrically-opposite sides of the extension b of the plumb-bob body A are formed apertures f, to admit of inserting a wire for pressing the spring-ring 6 when it is desired to remove it from the chamber d.

The point B is provided at one end with the conical-poin ted part g, and at the opposite end ing the shank of the point i, the said point 'i being made a little larger in diameter than the bore of the point B. The point iis finer than the point g,and is used for very accurate work. By this construction finer or coarser points may be used, as will be required for more or less accurate work. Should the point 2' become broken the remaining portion can be readily removed from the spring-arms j and a new one inserted. lVhen not desired for use, it is inserted in the bore of the body A.

Having thus described my invention, I claim as new and desire to secure by Letters Patent-- 1. In a plumb-bob, the axially-bored body A, provided with the annular chamber (1, and a split spring-rin g 6, held within the chamber, said chamber (1 having lateral apertures f, whereby a suitable tool may be inserted to remove the split spring-ring, substantially as specified.

2. In a plumb-bob, the combination of an axially-bored body A, carrying the cord G,and provided with the annular chamber d, the split spring-ring e, held in said chamber, and the point B, fitted to the bore of the body A and adapted to be adj u stably clamped by the split spring-ring, substantially as shown and described.

3. As an improved article of manufacture, a plumb-bob consistingof an axially-bored body provided with a clamping-ring in the lower end of the bore, and a reversible point having a conical-pointed part at one end and a removable point at the other, as set forth.

4. The combination of the axially-bored plum b-bob body A, the point B, provided with the spring-arms j, the auxiliary point 1', provided with the shank :p, and the spring-ring 6, adapted to clamp the point B in the body A, substantially as specified.

JOHN M. CAMERON.

YVitnesses:

ARCHD. MoPHEEsoN, J'No. STEUERLEIN. 

